[Gate-users] Simulated energy spectrum not same as actual energy spectrum

[Matthew Strugari]

Hi Adolf,

Have you adjusted your production thresholds/cuts? It’s likely that you’re missing secondary and tertiary interactions due to the default cut off value of the world (1.0 mm).

Regards,
Matthew

--
Matthew Strugari
PhD Candidate at Biomedical Translational Imaging Centre - BIOTIC,
5890 University Ave, Halifax, NS, B3K 6R8


From: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> on behalf of Adolf Nordin <Adolfn at axim.co.za>
Date: Tuesday, June 15, 2021 at 10:29
To: gate-users at lists.opengatecollaboration.org <gate-users at lists.opengatecollaboration.org>
Subject: [Gate-users] Simulated energy spectrum not same as actual energy spectrum
CAUTION: The Sender of this email is not from within Dalhousie.
Hi

I’ve hit 2 walls, bit want to sort the first.

I have a simple geometry for a SPECT system:

SPECTHEAD
Lead shielding
Al cover under the crystal
Crystal
Back cover
No collimator (doing intrinsic tests).

Source

The simulation runs fine.

However, when I compare the energy spectrum from the simulation with an actual energy spectrum from the camera, I get very little low energy counts.

So I cannot say that the simulation is a true reflection of the actual system.

Is this a known issue, or am I missing something.

Thanks.
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